Hoisting mechanism



Sept 17, 1929- J. F. HENDERSON 1,728,861 l HOISTING MECHANISM Filed OGL30. 1925 2 Sheets-Sheet 1 V*bl k i N l 'Q l IIT m (pl 1 mj: 1 'M MM S sai E .mi 5 l m n w l N h 1 l Q. *l

o A i N R Q) x as 0 u* x1 lk 1| N Ik() E i m a Patented Sept. 17, 1929UNITED 4stars s PATENT oFFicE JAMES r. HENDERSON, or DETROIT, MICHIGAN,AssrGNoR To mflTRorr RIVER IRON n WORKS, F DETROIT, MICHIGAN,AnCOBPQBATlON 0E MICHIGAN HOISTING MECHANLSM Application filed octobereo, 1925. seriarNo. 65,750.

To manipulate various kindsof loads by swing-derrick orswing boomcranes, port able steam derricks, cable hoists yand c0nveyor, and othertypes of hoists, it is necessary to control aplurality of cables, andfor this purpose I have put into practice a hoisting mechanism includinga plurality of drums whichmay be selectively driven andicontrelled by acompact and durable power transmission meehanism and brake' drum andlever arrangement. i

Without confining my invention to any specific use, the construction ofthe hoisting mechanisnrwill now be described by aid of `the drawings,`wherein Figure 1 is a front elevation of the hoisting mechanism; f

Fig.f2 is a horizontal sectional viewtaken on the line IIII of Fig. y1;

Fig. 3 is a cross sectional view taken yon the line III III of Fig.17showing the drive means.

control means, and

Fig. 4 is a similar view tekenen theline f IVQIV of Fig. 1, showing thebrake/control The hoisting mechanisml'includes albed frame 1 and mountedyon one end thereof is a conventional form of steam engine 2representing a suitable source of power. The `engine has been shown ashaving a control valve 3 operatively connected by a link 4 to a crank 5on a rock shaft 6. This shaft is journaled in bearings 7 of the bedframe and is provided with a lever 8 so that the shaft may l be easilyrocked to actuate the valve 3 yand control the operation of the engine2.

Mounted on the bed frame 1 are A-frames 9 provided with bearings 10 fora longitudinally disposed driven shaft 11 which has one end thereofprovided with a large gear wheel 12 meshing with a gear wheel 13 on thedrive shaft 14 of the engine 2, and obviously the shaft 11 might bedriven by an electric motor substituted for the engine 2.

The A-frames 9 are provided with 1ongitudinally alining bearings 15 andliked in said bearings is a longitudinal shaft 16. Rotatable on thisshaft are hoisting drums 17 and each hoisting drum has a brake drum 18`at one end thereof and a large gear wheel 19 at its opposite end. It isto the hoisting drums 17 thatfcables may be attached and wound thereonforfcontrolling the movement of a load or load carrier. f 4 l Meshingwith the large gear wheels 19 of the drums y17 are vsmall gear wheels 20loose on the driven shaft 11 and each small gear wheel has a clutch faceor member engageable by a clutch 21 at the side of said gear wheel. Theclutches 21 are slidably keyed Aon the driven shaft 11 and adapted to`rotate therewith and at `times couplethe .gear wheels 20 to the'drivenshaft to establish rotation of the hoisting drums 17 by the drivenshaft11. The `clutches 21 are operatively engaged by yokes22 ofy bell cranks23 ivotallymounted on the bedframe 1. The iell cranks 2 3 are connectedby links 24 to the lower ends of levers 25 which extend upwardly infront of the drums andy are .pivotally supported by a` longitudinallykdisposed bracket 26 connecting the Asframes 9. f f i The clutch yokes 22are connected by coiled retractile springs 27 to the bracket 26and thesesprings are positioned so vthat they clutches will be held' eitherengaged or disengaged. relative to the small gear'wheels 20.Thehorizontal sectional View shown in Fig.

2 has been takenbelow the springs 27, but one i' of the springs has beenindicated by dotted lines to show how it will be swung from one side ofa bell crank pivot to the other side whereby its retractile force mayhold the-bell crank in either position to maintain the clutch eitherinior out, thus permitting an attendant of the-hoisting machine settinga clutch by manipulation of one of the levers 25 and devoting hisattention toother levers. As an f nected to 'saidbearing is a shacklev29 ,of3

a brake band 30 which extends over and about ythe .brakeV drum 18,' asbest shown in Fig. 4. The brake band 4has a conventional form of shoely`and said brake band is provided with a shackle 32 to which is pivotallyconnected a rod 33, said rod extending Jforwardly from under the brakeband and through an opening 34 in the bracket 26. On the outerscrewthreaded end of the rod 33 are nuts or abutments 35 with theinnermost abutment engaged by the convex face 36 of a rod shiftingmember 37 through whichthe rod 33 extends. The rod shifting member 37kis pivotally connected to the bracket- 26, as at 38, and the upper endof said rod shifting member is pivotally connected by a link 39 to thelower angular end of a lever 40. This lever is pivotally Connected tothe bearing 28 and extends upwardly in front of the machine.

Encircling the rod 33, between the shackle 32 and the bracket 26, is acoiled expansion spring 41 and the expansive force of this spring isadapted to release the brake band relative to the brake drum, when thelever 40 is in a brake released position. The expansive forceof thespring 4l also assists in retaining the lever 40 in a brake appliedposition. This is brought about by the toggle arrangement of the lever40 and link 39 relative to the rod actuating member 3T. As shown in Fig.4 the brake band is applied and the expansive force of the spring 41maintains the pivotal connection 42 of the link and lever below theplane of the lever pivot 43 andthe link pivot 44. In this position theexpansion spring 4l tends to draw the rod 33 and the upper pivot point44 on the me1nber37` inwardly towards the drum. Suchy movement howeveris very slight and is limited by the lower end of the lever 40.Nevertheless the spring actionis a force rwhich maintains the pivotpoint 42 below a line connecting the pivot points 43 and'44, and thisrelation of the pivot points determines the applied position of thebrake. The toggle is broken upwardly by pushing the upper end of thelever 40towards the brake drum, whereupon the pivot 42 assumes aposition above a line connecting the pivots 43 and 44. This relativeposition of `the several pivot points determines the release position ofthe band on the brake drum, and this position is maintained by theexpansive ioree of the spring 41 which-draws the pivot point 44 towardsthe point 43 and prevents the point 42 from dropping.

While the hoisting mechanism may be used for various purposes, it hasbeen especially designed for sand suckers, a type of river vessel'provided with an outboard boom supporting a sand sucking pipe having anozzle or head that is lowered to the bottom ofy the river to obtainsand therefrom. The sand pipe and its nozzle are supported at intervalsalong the boom so that the n ozzle end of the pipe may be lifted fromtime to time and the boom swung so that lthe nozzle may be placed inanother position for obtaining sand. The manipulation of the sand pipecan be easily performed by my hoisting mechanism and I attachconsiderable importance to the fact that all of the hoisting drums andbrake drums are coaxially of one another on a common longitudinallydisposed shaft support. This arrangement is considered very compact andadvantageous on the deck of a vessel compared to individual hoistingdrums otherwise arranged, and it is obvious that a single attendant ofthe hoisting machine may readily control all of the levers in oneposition, since the levers are in proximity to each other and may beindividually set whereby the attendant may safely leave one lever toactuate another.

It is thought that the operation and utility otl the hoisting mechanismwill be apparent without further description, and while in the drawingsthere is illustrated a mechanism which has gone into general use, yet Iwould have it understood that the construction is susceptible to suchchanges as are permissible by the appended claim.

WVhat I claim is In aV brake, a drum, a brake band about said drum, afixed bracket having one end of said band connected thereto, a rodextending laterally through said bracket under said brake drum andconnected to the remaining end of said brake band, a lever pivotallysupported from said bracket, toggle levers operatively connecting saidlever to said rod and adapted in one position to maintain said brakeband applied, and means on said rod engaging said bracket adapted toeither maintain the toggle levers with the brake band applied or retainsaid brake band in released relation to said brake drum.

In testimony whereof I-aiiix my signature.

JAMES F.` HENDERSON.

